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waste their plan would accommodate. I believe that his is a <br />• desirable amendment to their plan, if properly executed. Because <br />there would be no elevated embankment, slope stability is not a <br />concern. However, I am concerned that ground waters might invade <br />the unencapsulated waste, producing a potentially detrimental <br />leachate. Dampness has been noted or the slopes of the portal <br />excavation in the past. The application fails to quantify the <br />amount of waste which would be accommodated at the site. <br />The applicant should provide more detail concerning the preparation <br />of the site and the placement of the waste material to preclude <br />possible problems. The applicant should thoroughly address the <br />possible hydrological implications of the proposed waste disposal. <br />If the applicant can satisfy water quality criteria, then I would <br />have no objection to the proposal. If necessary to preclude <br />deterioration of ground water quality, the waste could be <br />encapsulated in impermeable material. <br />RESPONSE: Please see responses to issues 3a and 6b above. <br />SUBSIDENCE <br />Summary <br />The application includes a life-of-mine plan which projects coal <br />extraction in both the No. 5 and No. 6 mines ._ The preferred mining <br />method is longwall, but the applicant requests the right to <br />substitute room and pillar techniques to supplement extraction. <br />Because of the efforts necessary for initial development, projected <br />subsidence is relatively limited within the initial five year <br />permit period. However, the life-of-mine flan projects mining <br />beneath State Highway 13, the D&RGW Railroad Spur, and the Williams <br />Fork and Yampa rivers and their associated alluvial valley floors. <br /> <br />39-22 <br />